Development of fuel cells

The general concept of a fuel battery, or fuel cell, dates back to the early days of electrochemistry. British physicist William Grove used hydrogen and oxygen as fuels catalyzed on platinum electrodes in 1839. During the late 1880s two British chemists—Carl Langer and German-born Ludwig Mond—developed a fuel cell with a longer service life by employing a porous nonconductor to hold the electrolyte. It was subsequently found that a carbon base permitted the use of much less platinum, and the German chemist Wilhelm Ostwald proposed, as a substitute for heat-engine generators, electrochemical cells in which carbon would be oxidized to carbon dioxide by oxygen. During the early years of the 20th century, Fritz Haber and Walther H. Nernst in Germany and Edmond Bauer in France experimented with cells using a solid electrolyte. Limited success and high costs, however, suppressed interest in continuing developmental efforts.

From 1932 until well after World War II, British engineer Francis Thomas Bacon and his coworkers at the University of Cambridge worked on creating practical hydrogen-oxygen fuel cells with an alkaline electrolyte. Research resulted in the invention of gas-diffusion electrodes in which the fuel gas on one side is effectively kept in controlled contact with an aqueous electrolyte on the other side. By mid-century O.K. Davtyan of the Soviet Union had published the results of experimental work on solid electrolytes for high-temperature fuel cells and for both high- and low-temperature alkaline electrolyte hydrogen-oxygen cells.

The need for highly efficient and stable power supplies for space satellites and manned spacecraft created exciting new opportunities for fuel cell development during the 1950s and ’60s. Molten carbonate cells with magnesium oxide pressed against the electrodes were demonstrated by J.A.A. Ketelaar and G.H.J. Broers of the Netherlands, while the very thin Teflon-bonded, carbon-metal hybrid electrode was devised by other researchers. Many other technological advances, including the development of new materials, played a crucial role in the emergence of today’s practical fuel cells. Further improvements in electrode materials and construction, combined with the rising costs of fossil fuels, are expected to make fuel cells an increasingly attractive alternative power source, especially in Japan and other countries that have meagre nonrenewable energy resources. At the beginning of the 21st century, many electrical-equipment manufacturers were developing power-generation equipment based on fuel cell technology.

The American military is funding development of small fuel cells for soldiers to carry in their backpacks in order to power various electronic devices, for powering small pilotless reconnaissance aircraft, and for powering robots to clear minefields.